Geoengineering And Iron

I first learned about the Iron Hypothesis in Earth Magazine back in 1996. This hypothesis has been tested, and as usual, nature is more complex than we can imagine. See PhysOrg: Ocean carbon: A dent in the iron hypothesis

...study reveals that most of the carbon from lush plankton blooms never reaches the deep ocean.

The results are interesting because fertilizing the oceans with iron in order to sequester carbon is a geoengineering idea, and the White House science adviser has not taken geoengineering off the table. See NYT: Science Adviser Lays Out Climate and Energy Plans